<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数"
                type="warning"
                :closable="false"
                show-icon>
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品的级联选择框 -->
          <el-cascader expand-trigger="hover"
                       v-model="selectCateKeys"
                       :options="catelist"
                       :props="cateProps"
                       @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName"
               @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数"
                     name="many">
          <el-button type="primary"
                     size="mini"
                     :disabled="isBtnDisabled"
                     @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData"
                    border
                    stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals"
                        :key="i"
                        closable
                        @close="handleClosed(i, scope.row)">{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag"
                          v-if="scope.row.inputVisible"
                          v-model="scope.row.inputValue"
                          ref="saveTagInput"
                          size="small"
                          @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else
                           class="button-new-tag"
                           size="small"
                           @click="showInput(scope.row)">添加</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称"
                             prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini"
                           type="primary"
                           icon="el-icon-edit"
                           @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                <el-button size="mini"
                           type="danger"
                           icon="el-icon-delete"
                           @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性"
                     name="only">
          <el-button type="primary"
                     size="mini"
                     :disabled="isBtnDisabled"
                     @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData"
                    border
                    stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals"
                        :key="i"
                        closable
                        @close="handleClosed(i, scope.row)">{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag"
                          v-if="scope.row.inputVisible"
                          v-model="scope.row.inputValue"
                          ref="saveTagInput"
                          size="small"
                          @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else
                           class="button-new-tag"
                           size="small"
                           @click="showInput(scope.row)">添加</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称"
                             prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini"
                           type="primary"
                           icon="el-icon-edit"
                           @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                <el-button size="mini"
                           type="danger"
                           icon="el-icon-delete"
                           @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title=" '添加' + titleText"
               :visible.sync="addDialogVisible"
               width="50%"
               @close="addDialogClosed">
      <!-- 添加参数表单 -->
      <el-form :model="addForm"
               :rules="addFormRules"
               ref="addFormRef"
               label-width="100px">
        <el-form-item :label="titleText"
                      prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer"
            class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary"
                   @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog :title=" '添加' + titleText"
               :visible.sync="editDialogVisible"
               width="50%"
               @close="editDialogClosed">
      <!-- 添加参数表单 -->
      <el-form :model="editForm"
               :rules="editFormRules"
               ref="editFormRef"
               label-width="100px">
        <el-form-item :label="titleText"
                      prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer"
            class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary"
                   @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data () {
    return {
      //商品分类列表
      catelist: [],
      //级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
      },
      //级联选择框双向绑定的事件
      selectCateKeys: [],
      //被激活的页签名称
      activeName: 'many',
      //动态参数的数据
      manyTableData: [],
      //静态属性的数据
      onlyTableData: [],
      //控制添加对话框的显示和隐藏
      addDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {},
      //添加表单的验证规则
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: blur }
        ]
      },
      //控制丢该对话框的显示和隐藏
      editDialogVisible: false,
      //修改的表单数据对象
      editForm: {},
      //修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: blur }
        ]
      }
    }
  },
  created () {
    //获取所有的商品分类列表
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.catelist = res.data
      console.log(this.catelist)
    },
    //级联选择框中项变化，会触发这个函数
    handleChange () {
      this.getParamsData()
    },
    //tab 页签点击事件的处理函数
    handleTabClick () {
      console.log(this.activeName)
      this.getParamsData()
    },
    //获取参数的列表数据
    async getParamsData () {
      //   console.log(this.selectCateKeys)
      //证明选中的不是三级分类
      if (this.selectCateKeys.length !== 3) {
        this.selectCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }

      //证明是三级分类
      console.log(this.selectedCateKeys)
      //根据所选分类的id，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      console.log(res.data)
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        //控制文本框的显示和隐藏
        item.inputVisible = false
        //文本框中输入的值
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    //监听添加对话框的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    //点击按钮添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    //点击按钮展示修改的对话框
    async showEditDialog (attr_id) {
      //查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
        params: { attr_sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    //重置修改的表单
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    //点击按钮，修改参数信息
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }

        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    //根据id删除对应的参数项
    async removeParams (attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      //用户取消了删除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除！')
      }

      //删除业务逻辑
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    // 文本框失去焦点或按下了 Enter 都会触发
    async handleInputConfirm (row) {
      console.log('ok')
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return，则证明输入的内容需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrValis(row)
    },
    //将对attr_vals的操作，保存到数据库
    async saveAttrValis (row) {
      //需要发起请求，保存这次操作
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }
      this.$message.success('修改参数项成功！')
    },
    //点击按钮展示文本输入框
    showInput (row) {
      row.inputVisible = true
      // 然文本框自动获得焦点
      // $nextTick 方法的作用就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    //删除对应的参数可选项
    handleClosed (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrValis(row)
    }
  },
  computed: {
    //如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled () {
      if (this.selectCateKeys.length !== 3) {
        return true
      }
      return false
    },
    //当前选中的三级分类的id
    cateId () {
      if (this.selectCateKeys.length === 3) {
        return this.selectCateKeys[2]
      }
      return null
    },
    //动态计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>
<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
}
</style>